No one speaks about what cannot be spoken about.
"Speak about" is said in many ways.
It needs, however, to be kept fixed in the two parts of the sentence.
Sounds politically correct.
These are the most interesting cases. Robert Aumann had the example of two merchants who both independently come upon the idea that "if I was a foreign merchant, I would use this star to coordinate", and thus begin coordinating. And it happens all the time in things like corporations, criminal enterprises, youth culture, etc. where the important things require them not to be talked about, and participants are required to see through the cover stories and imagine "what if" in order for the enterprise to properly function.
Everything is something. Whatever is something is in the extension of '... is something.' I have spoken the extension '... is something.' Whatever is in the extension of something I have spoken has been spoken about. Whatever has been spoken about can be spoken about. So everything can be spoken about.
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